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ISL97632IRT14Z-T Datasheet(PDF) 4 Page - Intersil Corporation |
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ISL97632IRT14Z-T Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 9 page 4 FN9239.3 February 22, 2008 Single-Wire Serial Interface The ISL97632 uses a simple single-wire serial interface for programming the output brightness of the LEDs. A 5-bit interface is used to give a total of 32 levels of output brightness. The interface uses a normally high connection for use with open-drain driving schemes and Intersil’s proprietary XSD bus. When held low for between 15µs and 45µs, the interface registers a logic 1. When held low for between 90µs and 120µs the interface registers a logic 0. When held low for greater that 215µs, the interface loads the last 5 bits into the brightness control register and updates the brightness level. The required minimum high time is 3µs. This simple single-wire programming is summarized as follow: • Logic 0 = Negative pulse >90µs and <120µs • Logic 1 = Negative pulse >15µs and <45µs • Load = Negative pulse >215µs Figure 1 shows an example of programming a binary code of 10100 and load it in to the device serial register. The serial interface is automatically reset to 0 when the device is disabled, or enters UVLO. Therefore, when the part is enabled, the output brightness is automatically set to the minimum level. 30µs 100µs 220µs '1' '0' '1' '0' '0' 'LOAD' 0 200 400 600 800 1000 1200 µs FIGURE 1. SINGLE-WIRE XSD INTERFACE ISL97632 |
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